<template>
  <view class="cart">
    <!-- 1 列表 -->
    <view class="cart-list">
      <view
        class="cart-item"
        v-for="(item,index) in cartList"
        :key="item.goods_id"
      >
        <!-- 1 复选框 -->
        <view class="goods-chk">
          <u-checkbox
            :value="item.checked"
            shape="circle"
            active-color="red"
            @change="handleItemCheck(index)"
          ></u-checkbox>
        </view>
        <!-- 2 图片 -->
        <view class="goods-img">
          <u-image
            width="191rpx"
            height="191rpx"
            :src="item.goods_small_logo"
          ></u-image>
        </view>
        <!-- 3 信息 -->
        <view class="goods-info">
          <!-- 名称 -->
          <view class="goods-name u-line-2">{{item.goods_name}}</view>
          <!-- 价格和数量 -->
          <view class="goods-price-num">
            <view class="goods-price">￥{{item.goods_price}}</view>
            <view class="goods-num-tool">
              <view
                class="num-btn"
                @click="handleNumUpdate(-1,index)"
              >-</view>
              <view class="goods-vnum">{{item.nums}}</view>
              <view
                class="num-btn"
                @click="handleNumUpdate(1,index)"
              >+</view>
            </view>
          </view>
        </view>
      </view>

    </view>
    <!-- 2 统计 -->
    <view class="statistics">
      <view class="all-chk">
        <u-checkbox
          :value="allChecked"
          shape="circle"
          active-color="red"
          @change="handleAllCheck"
        >全选</u-checkbox>
      </view>
      <view class="all-price">
        合计: <text>￥{{checkedPrice}}</text>
      </view>
      <view class="all-count">
        <u-button
          type="error"
          shape="circle"
          @click="handleGoPay"
        >去结算({{checkedCount}})</u-button>
      </view>
    </view>
  </view>
</template>

<script>
import { mapState, mapMutations } from "vuex";
export default {
  computed: {
    ...mapState({
      cartList: (state) => state.cart.cartList,
    }),

    // 全选
    allChecked() {
      // 要求 购物车数组 每一种商品都选中  全选=选中
      return (
        this.cartList.length && this.cartList.every((item) => item.checked)
      );
    },
    // 统计 购买的数量
    checkedCount() {
      let count = 0;
      this.cartList.forEach((item) => {
        if (item.checked) {
          count += item.nums;
        }
      });
      return count;
    },

    // 统计 购买的总金额
    checkedPrice() {
      let price = 0;
      this.cartList.forEach((item) => {
        if (item.checked) {
          price += item.nums * item.goods_price;
        }
      });
      return price;
    },
  },
  methods: {
    ...mapMutations([
      "cart/cartGoodsChecked",
      "cart/cartGoodsNumUpdate",
      "cart/cartGoodsRemove",
      "cart/cartAllGoodsChecked",
    ]),
    // 商品的选中功能
    handleItemCheck(index) {
      // console.log(index);
      // 数据 存放在vuex中！！！
      // mutations 来修改！！
      this["cart/cartGoodsChecked"]({ index });
    },
    // 点击数量编辑按钮 - || +
    async handleNumUpdate(unit, index) {
      // 判断用户是否想要删除  当前的数量 和 点击 “-”
      if (this.cartList[index].nums === 1 && unit === -1) {
        // 弹出 确认框 是否想要删除
        const [err, result] = await uni.showModal({
          title: "提示",
          content: "您是否想要删除",
          showCancel: true,
          cancelText: "取消",
          cancelColor: "#000000",
          confirmText: "确定",
          confirmColor: "#3CC51F",
        });
        if (result.confirm) {
          // 想要删除
          // console.log("想要删除");
          this["cart/cartGoodsRemove"]({ index });
        } else {
          // console.log("什么都不做");
        }
      } else {
        this["cart/cartGoodsNumUpdate"]({ unit, index });
      }
    },

    // 点击 全选
    handleAllCheck() {
      // 1 获取到当前的 全选按钮  选中按钮  -> 取反
      const allChecked = !this.allChecked;
      // 2 mutations 把全选状态 传递过去 挨个修改数组元素 checked
      this["cart/cartAllGoodsChecked"]({ checked: allChecked });
    },
  // 点击跳转
    handleGoPay(){
      if(this.checkedCount===0){
        uni.showToast({
          title:'您没有选择商品',
          icon:'none'
        })
      }else{
        uni.navigateTo({url:'/pages/pay/pay'})
      }

    }
  },
};
</script>

<style lang="scss">
.cart {
  padding-bottom: 111rpx;
  .cart-list {
    .cart-item {
      display: flex;
      padding: 10rpx;
      border-bottom: 1rpx solid #ccc;
      .goods-chk {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
      }

      .goods-img {
        flex: 2;

        display: flex;
        align-items: center;
        justify-content: center;
      }

      .goods-info {
        color: #666;
        flex: 3;
        display: flex;
        flex-direction: column;
        justify-content: space-around;
        .goods-name {
        }

        .goods-price-num {
          display: flex;
          justify-content: space-between;
          .goods-price {
            color: $themeColor;
          }

          .goods-num-tool {
            width: 140rpx;
            height: 40rpx;

            display: flex;
            justify-content: space-between;
            .num-btn {
              border: 1rpx solid #ccc;
              border-radius: 50%;
              width: 40rpx;
              height: 40rpx;
              text-align: center;
              line-height: 40rpx;
            }

            .goods-vnum {
            }
          }
        }
      }
    }
  }
  .statistics {
    position: fixed;
    background-color: #fff;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    border-top: 1rpx solid #ccc;
    display: flex;
    align-items: center;
    padding: 15rpx;
    .all-chk {
    }

    .all-price {
      flex: 1;
      color: #666;
      text {
      }
    }

    .all-count {
    }
  }
}
</style>